This report by the REMI Partnership, which is comprised of Colorado Association of REALTORS®, the Colorado Bankers Association, Colorado Concern, Common Sense Policy Roundtable, and Denver South Economic Development Partnership, evaluates the impacts of Amendment 73 with the REMI Tax-PI model. Amendment 73 would adjust the current flat individual income tax rate laid out in the Colorado constitution by imposing a progressive rate for individual and joint income filers who earn above $150,000. This legislation transfers the state’s relatively low flat tax, with individuals and corporations paying the same rate, to a graduated income tax that would alter Colorado’s economic outlook. The higher taxes and higher spending on education called for in Amendment 73 would generate immediate impacts, but there is no certainty that it would increase performance impacts, such as improved graduation rates.